dilatation

Etymology

From Old French dilatation, from Late Latin dīlātātio, early 15th c.

noun

1. Prolixity; diffuse discourse.
2. The act of dilating; expansion; an enlarging on all sides; the state of being dilated
   These [boys being groomed as prostitutes] are sold by their parents (sometimes stolen from them), about the age of 4, and educated, while they are also subjected to a special physical training, which includes massage of the gluteal regions to favor development, dilatation of the anus, and epilation (which is not, however, practised by Chinese women). 1927, Havelock Ellis, Studies in the Psychology of Sex, Volume 2 (of 6)
3. A dilation or enlargement of a canal or other organ.